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Tounkite

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About TounkiteHide

Formula:
(Na,Ca,K)8(Al6Si6O24)(SO4)2Cl · H2O
Colour:
Green to yellowish-green, glass-green with a yellowish or gray tint
Lustre:
Vitreous
Hardness:
5 - 5½
Crystal System:
Hexagonal
Name:
Named after its discovery locality, Tounka Valley, Baikal region, Russia.
This page provides mineralogical data about Tounkite.


Classification of TounkiteHide

Approved
Approval Year:
1990
9.FB.05

9 : SILICATES (Germanates)
F : Tektosilicates without zeolitic H2O
B : Tektosilicates with additional anions
76.2.5.14

76 : TECTOSILICATES Al-Si Framework
2 : Al-Si Framework Feldspathoids and related species

Physical Properties of TounkiteHide

Vitreous
Colour:
Green to yellowish-green, glass-green with a yellowish or gray tint
Streak:
White
Hardness:
5 - 5½ on Mohs scale
Cleavage:
Distinct/Good

Optical Data of TounkiteHide

Type:
Uniaxial (+)
RI values:
nω = 1.528 nε = 1.543
Max Birefringence:
δ = 0.015
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low

Chemical Properties of TounkiteHide

Formula:
(Na,Ca,K)8(Al6Si6O24)(SO4)2Cl · H2O
IMA Formula:
(Na,Ca,K)8(Si6Al6)O24(SO4)2Cl · 0.5H2O

Crystallography of TounkiteHide

Crystal System:
Hexagonal
Cell Parameters:
a = 12.84 Å, c = 32.23 Å
Ratio:
a:c = 1 : 2.51
Unit Cell V:
4,601.73 ų (Calculated from Unit Cell)

Type Occurrence of TounkiteHide

Synonyms of TounkiteHide

Other Language Names for TounkiteHide

German:Tounkit
Spanish:Tounkita

Relationship of Tounkite to other SpeciesHide

Other Members of this group:
Afghanite(Na,K)22Ca10(Si24Al24O96)(SO4)6Cl6Trig. 3m : P3 1c
Alloriite(Na,Ca,K)26Ca4(Al6Si6O24)4(SO4)6Cl6Trig. 3m : P3 1c
Balliranoite(Na,K)6Ca2(Si6Al6O24)Cl2(CO3)Hex. 6 : P63
Biachellaite(Na,Ca,K)8(Al6Si6O24)(SO4)2(OH)0.5 · H2OTrig. 3 : P3
Bystrite(Na,K)7Ca(Al6Si6O24)(S5)ClHex.
Cancrinite(Na,Ca,☐)8(Al6Si6O24)(CO3,SO4)2 · 2H2OHex. 6 : P63
CancrisiliteNa7(Al5Si7O24)(CO3) · 3H2OHex.
Davyne(Na,K)6Ca2(Al6Si6O24)(Cl2,SO4)2Hex. 6/m : P63/m
DepmeieriteNa8(Al6Si6O24)(PO4,CO3)1-x · 3H2O (x<0.5)Hex. 6 : P63
Franzinite(Na,K)6Ca2(Al6Si6O24)(SO4)2 · 0.5H2OHex.
Giuseppettite(Na,K,Ca)7-8(Al6Si6O24)(SO4,Cl)1-2Hex.
HydroxycancriniteNa8(Al6Si6O24)(OH)2 · 2H2OHex.
KircheriteNa5Ca2K(Al6Si6O24)(SO4)2 · 0.33H2OTrig. 3 2 : R3 2
KyanoxaliteNa7(Al6-xSi6+xO24)(C2O4)0.5+x · 5H2O (0 < x < 0.5)Hex. 6 : P63
Liottite(Na,K)16Ca8(Al6Si6O24)3(SO4)5Cl4Hex.
Marinellite(Na,K)42Ca6(Al6Si6O24)6(SO4)8Cl2 · 3H2OTrig. 3m : P3 1c
MicrosommiteNa4K2Ca2(Al6Si6O24)(SO4)Cl2Hex.
PitiglianoiteNa6K2(Al6Si6O24)(SO4) · 2H2OHex.
Quadridavyne(Na,K)6Ca2(Al6Si6O24)Cl4Hex.
Sacrofanite(Na61K19Ca32)(Si84Al84O336)(SO4)26Cl2F6•2H2OHex.
SulfhydrylbystriteNa5K2Ca[Al6Si6O24](S5)2(SH)Trig. 3m : P3 1c
Vishnevite(Na,K)8(Al6Si6O24)(SO4,CO3) · 2H2OHex. 6 : P63

Common AssociatesHide

Associated Minerals Based on Photo Data:
Calcite3 photos of Tounkite associated with Calcite on mindat.org.
Diopside3 photos of Tounkite associated with Diopside on mindat.org.
Afghanite2 photos of Tounkite associated with Afghanite on mindat.org.
Pyrite2 photos of Tounkite associated with Pyrite on mindat.org.
Lazurite2 photos of Tounkite associated with Lazurite on mindat.org.
Fluorapatite2 photos of Tounkite associated with Fluorapatite on mindat.org.
Chabazite-Ca2 photos of Tounkite associated with Chabazite-Ca on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.FB.05Afghanite(Na,K)22Ca10(Si24Al24O96)(SO4)6Cl6Trig. 3m : P3 1c
9.FB.05Bystrite(Na,K)7Ca(Al6Si6O24)(S5)ClHex.
9.FB.05Cancrinite(Na,Ca,☐)8(Al6Si6O24)(CO3,SO4)2 · 2H2OHex. 6 : P63
9.FB.05CancrisiliteNa7(Al5Si7O24)(CO3) · 3H2OHex.
9.FB.05Davyne(Na,K)6Ca2(Al6Si6O24)(Cl2,SO4)2Hex. 6/m : P63/m
9.FB.05Franzinite(Na,K)6Ca2(Al6Si6O24)(SO4)2 · 0.5H2OHex.
9.FB.05Giuseppettite(Na,K,Ca)7-8(Al6Si6O24)(SO4,Cl)1-2Hex.
9.FB.05HydroxycancriniteNa8(Al6Si6O24)(OH)2 · 2H2OHex.
9.FB.05Liottite(Na,K)16Ca8(Al6Si6O24)3(SO4)5Cl4Hex.
9.FB.05MicrosommiteNa4K2Ca2(Al6Si6O24)(SO4)Cl2Hex.
9.FB.05PitiglianoiteNa6K2(Al6Si6O24)(SO4) · 2H2OHex.
9.FB.05Quadridavyne(Na,K)6Ca2(Al6Si6O24)Cl4Hex.
9.FB.05Sacrofanite(Na61K19Ca32)(Si84Al84O336)(SO4)26Cl2F6•2H2OHex.
9.FB.05Vishnevite(Na,K)8(Al6Si6O24)(SO4,CO3) · 2H2OHex. 6 : P63
9.FB.05Marinellite(Na,K)42Ca6(Al6Si6O24)6(SO4)8Cl2 · 3H2OTrig. 3m : P3 1c
9.FB.05Farneseite(Na,Ca,K)56(Al6Si6O24)7(SO4)12 · 6H2OHex. 6/m : P63/m
9.FB.05Alloriite(Na,Ca,K)26Ca4(Al6Si6O24)4(SO4)6Cl6Trig. 3m : P3 1c
9.FB.05Fantappièite[Na82.5Ca33K16.5](Si99Al99O396)(SO4)33 · 4H2OTrig. 3 : R3
9.FB.05KyanoxaliteNa7(Al6-xSi6+xO24)(C2O4)0.5+x · 5H2O (0 < x < 0.5)Hex. 6 : P63
9.FB.05Balliranoite(Na,K)6Ca2(Si6Al6O24)Cl2(CO3)Hex. 6 : P63
9.FB.05CarbobystriteNa8(Al6Si6O24)(CO3) · 3.5H2OTrig. 3m : P3 1c
9.FB.05DepmeieriteNa8(Al6Si6O24)(PO4,CO3)1-x · 3H2O (x<0.5)Hex. 6 : P63
9.FB.05KircheriteNa5Ca2K(Al6Si6O24)(SO4)2 · 0.33H2OTrig. 3 2 : R3 2
9.FB.10BicchuliteCa2(Al2SiO6)(OH)2Iso. 4 3m : I4 3m
9.FB.10DanaliteBe3Fe2+4(SiO4)3SIso. 4 3m : P4 3n
9.FB.10GenthelviteBe3Zn4(SiO4)3SIso. 4 3m : P4 3n
9.FB.10Haüyne(Na,K)3(Ca,Na)(Al3Si3O12)(SO4,S,Cl)Iso. 4 3m : P4 3n
9.FB.10HelvineBe3Mn2+4(SiO4)3SIso. 4 3m : P4 3n
9.FB.10KamaishiliteCa2(Al2SiO6)(OH)2Tet.
9.FB.10LazuriteNa6Ca2(Al6Si6O24)(SO4,S,S2, S3,Cl,OH)2Iso. 4 3m : P4 3n
9.FB.10NoseanNa8(Al6Si6O24)(SO4) · H2OIso. 4 3m : P4 3n
9.FB.10SodaliteNa8(Al6Si6O24)Cl2Iso. 4 3m : P4 3n
9.FB.10Tsaregorodtsevite(N(CH3)4)(AlSi5O12)Orth.
9.FB.10TugtupiteNa4BeAlSi4O12ClTet. 4 : I4
9.FB.15MarialiteNa4Al3Si9O24ClTet. 4/m : I4/m
9.FB.15MeioniteCa4Al6Si6O24CO3Tet. 4/m : I4/m
9.FB.15Silvialite(Ca,Na)4(Al6Si6O24)(SO4,CO3)Tet. 4/m : I4/m

Related Minerals - Dana Grouping (8th Ed.)Hide

76.2.5.1Afghanite(Na,K)22Ca10(Si24Al24O96)(SO4)6Cl6Trig. 3m : P3 1c
76.2.5.2Bystrite(Na,K)7Ca(Al6Si6O24)(S5)ClHex.
76.2.5.3Cancrinite(Na,Ca,☐)8(Al6Si6O24)(CO3,SO4)2 · 2H2OHex. 6 : P63
76.2.5.4CancrisiliteNa7(Al5Si7O24)(CO3) · 3H2OHex.
76.2.5.5Davyne(Na,K)6Ca2(Al6Si6O24)(Cl2,SO4)2Hex. 6/m : P63/m
76.2.5.6Franzinite(Na,K)6Ca2(Al6Si6O24)(SO4)2 · 0.5H2OHex.
76.2.5.7Giuseppettite(Na,K,Ca)7-8(Al6Si6O24)(SO4,Cl)1-2Hex.
76.2.5.8HydroxycancriniteNa8(Al6Si6O24)(OH)2 · 2H2OHex.
76.2.5.9Liottite(Na,K)16Ca8(Al6Si6O24)3(SO4)5Cl4Hex.
76.2.5.10MicrosommiteNa4K2Ca2(Al6Si6O24)(SO4)Cl2Hex.
76.2.5.11PitiglianoiteNa6K2(Al6Si6O24)(SO4) · 2H2OHex.
76.2.5.12Quadridavyne(Na,K)6Ca2(Al6Si6O24)Cl4Hex.
76.2.5.13Sacrofanite(Na61K19Ca32)(Si84Al84O336)(SO4)26Cl2F6•2H2OHex.
76.2.5.15Vishnevite(Na,K)8(Al6Si6O24)(SO4,CO3) · 2H2OHex. 6 : P63
76.2.5.16Wenkite(Ba,K)4(Ca,Na)6[(SO4)3|(Si,Al)20O39(OH)2] · 0.5H2OHex.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for TounkiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva (1992): 121(2): 92-95.
American Mineralogist (1994): 79: 187.
New Minerals (1997), New Minerals 1990-1994.

Internet Links for TounkiteHide

Localities for TounkiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Russia (TL)
 
  • Eastern-Siberian Region
    • Prebaikalia (Pribaikal'e)
      • Irkutskaya Oblast'
        • Lake Baikal area
          • Slyudyanka (Sludyanka)
            • Malaya Bystraya River Valley
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
Mineral and/or Locality  
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